/*
 * Copyright 2008 Cypal Solutions (tools@cypal.in)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package in.cypal.studio.gwt.core.facet;

import in.cypal.studio.gwt.core.Activator;
import in.cypal.studio.gwt.core.common.Util;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.project.facet.core.IDelegate;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;

/**
 * @author Prakash G.R.
 * 
 */
public class UpgradeDelegate implements IDelegate {

	public void execute(IProject project, IProjectFacetVersion facetVersion, Object config, IProgressMonitor monitor) throws CoreException {

		monitor = Util.getNonNullMonitor(monitor);
		monitor.beginTask("Updating classpath...", 3);
		try {

			removeGWTEntries(project, new SubProgressMonitor(monitor, 1));
			InstallDelegate.addUserLibToClassPath(project, new SubProgressMonitor(monitor, 1));
			InstallDelegate.addServletLibToWebInf(project, new SubProgressMonitor(monitor, 1));

		} catch (CoreException e) {
			Activator.logException(e);
		} finally {
			monitor.done();
		}

	}

	private void removeGWTEntries(IProject project, IProgressMonitor monitor) throws JavaModelException {

		monitor = Util.getNonNullMonitor(monitor);
		monitor.beginTask("Removing old entries...", 2);
		try {

			IJavaProject javaProject = JavaCore.create(project);
			List<IClasspathEntry> classpathEntries = new ArrayList<IClasspathEntry>();

			IClasspathEntry[] oldClasspath = javaProject.getRawClasspath();
			for (IClasspathEntry classpathEntry : oldClasspath) {
				if (!classpathEntry.getPath().lastSegment().startsWith("gwt"))
					classpathEntries.add(classpathEntry);
			}
			javaProject.setRawClasspath(classpathEntries.toArray(new IClasspathEntry[classpathEntries.size()]), new SubProgressMonitor(monitor, 1));

			IPath webContent = ComponentCore.createComponent(project).getRootFolder().getProjectRelativePath();
			IFile theLink = project.getFile(webContent.append("WEB-INF").append("lib").append("gwt-servlet.jar"));
			theLink.delete(true, new SubProgressMonitor(monitor, 1));

		} catch (CoreException e) {
			Activator.logException(e);
		} finally {
			monitor.done();
		}
	}

}
